[Python] Python csv DictReader with optional header

import csv
import io


FIELDNAMES = ['one', 'two', 'three']


def print_data_rows(csvfile):
reader = csv.DictReader(csvfile, fieldnames=FIELDNAMES)
for row in reader:
print(row)


headerless = r'''
1,2,3
'''
print_data_rows(io.StringIO(headerless.strip()))



headerful = r'''
one,two,three
1,2,3
'''
print_data_rows(io.StringIO(headerful.strip()))


I would like the output to be

{'one': '1', 'two': '2', 'three': '3'}
{'one': '1', 'two': '2', 'three': '3'}


but actually the output is

{'one': '1', 'two': '2', 'three': '3'}
{'one': 'one', 'two': 'two', 'three': 'three'}
{'one': '1', 'two': '2', 'three': '3'}


because DictReader is not skipping the header row, when it exists.

How can I skip the header row if it exists?

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